Impurity

Impurities are either naturally occurring or added during synthesis of a chemical or commercial product. During production, impurities may be purposely, accidentally, inevitably, or incidentally added into the substance.

The level of impurities in a material are generally defined in relative terms. Standards have been established by various organizations that attempt to define the permitted levels of various impurities in a manufactured product. Strictly speaking, then, a material's level of purity can only be stated as being more or less pure than some other material.

Destructive impurities

Impurities can be destructive when they obstruct the working nature of the material. Examples include ash and debris in metals and leaf pieces in blank white papers. The removal of impurities is usually done chemically. For example, in the manufacturing of iron, calcium carbonate is added to the blast furnace to remove silicon dioxide from the iron ore. Zone refining is an economically important method for the purification of semiconductors.

Impurity

Impurities are either naturally occurring or added during synthesis of a chemical or commercial product. During production, impurities may be purposely, accidentally, inevitably, or incidentally added into the substance.

The level of impurities in a material are generally defined in relative terms. Standards have been established by various organizations that attempt to define the permitted levels of various impurities in a manufactured product. Strictly speaking, then, a material's level of purity can only be stated as being more or less pure than some other material.

Destructive impurities

Impurities can be destructive when they obstruct the working nature of the material. Examples include ash and debris in metals and leaf pieces in blank white papers. The removal of impurities is usually done chemically. For example, in the manufacturing of iron, calcium carbonate is added to the blast furnace to remove silicon dioxide from the iron ore. Zone refining is an economically important method for the purification of semiconductors.

Latest News for: impurities

The site has invested in three inductively coupled plasma mass spectrometry (ICP-MS) systems, in a move to address the updated ICH Q3D regulatory guidelines on elemental impurities and establish a South East AsiaCenter of Excellence for elemental analysis....

This product is being recalled due to the trace amount of an impurity, N-nitrosodiethylamine (NDEA) contained in the API Losartan, USP manufactured by Zhejiang Huahai Pharmaceutical Co ... This impurity, which is a substance that occurs naturally in certain foods, drinking water, air ......

Irani advised women to accept that menstrual blood is impure and that a menstruating woman desecrates a place of worship ... Irani’s approach has less to do with religious belief and more to do with Manuvadi notions of purity and impurity, which hold Dalits and menstruating women to be equally impure....

APPLE is fitting its new iPhone handsets with "impure" glass, according to a popular gadget vlogger ... JerryRigEverything / YouTube. 7. Camera sensors are very fragile, and need tough glass to protect them ... 7 ... 7 ... 7 ... 7 ... 7 ... "Apple's impure sapphire, as you can see, starts scratching at a level 6, the same as glass," he explained ... 7 ... ....

It may look like a simple piece of alfoil, but when added to wastewater this high-tech strip of iron can remove impurities like dyes and heavy metals in just minutes ...Lead Researcher Associate Professor Laichang Zhang from ECU's School of Engineering said the technology could have significant applications in the textile and mining industries ... (noodl....